# python整数缓存和字符串驻留机制
a = 3000
b = 3000
print(id(a), id(b), a is b)


aa = "abcdddddddddDddddddddddddddddddddddd"
bb = "abcdddddddddDddddddddddddddddddddddd"
print(id(aa), id(bb), aa is bb)